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fnop FPU exception support (aka FreeBSD FPU probe) - sysenter/sysexit support (untested, not enabled in cpuid)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@869 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-05-29 11:08:52 +00:00
parent f66723fab9
commit 023fe10d24
4 changed files with 87 additions and 0 deletions
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44
target-i386/helper.c
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@ -1746,6 +1746,50 @@ void helper_lret_protected(int shift, int addend)
helper_ret_protected(shift, 0, addend);
}
void helper_sysenter(void)
{
if (env->sysenter_cs == 0) {
raise_exception_err(EXCP0D_GPF, 0);
}
env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK);
cpu_x86_set_cpl(env, 0);
cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
NULL, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc,
NULL, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_W_MASK | DESC_A_MASK);
ESP = env->sysenter_esp;
EIP = env->sysenter_eip;
}
void helper_sysexit(void)
{
int cpl;
cpl = env->hflags & HF_CPL_MASK;
if (env->sysenter_cs == 0 || cpl != 0) {
raise_exception_err(EXCP0D_GPF, 0);
}
cpu_x86_set_cpl(env, 3);
cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) | 3,
NULL, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) | 3,
NULL, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
ESP = ECX;
EIP = EDX;
}
void helper_movl_crN_T0(int reg)
{
switch(reg) {